Core sample tube



FIG. 1 is a front elevational view of a core sample tube showing my new design, the rear elevational view being a mirror image;

FIG. 2 is a top plan view;

FIG. 3 is a bottom plan view;

FIG. 4 is a left side elevational view; and

FIG. 5 is a right side elevational view thereof. 

The ornamental design for a core sample tube, as shown and described. 